Bio Wastewater Treatment Part 2

Biological Wastewater Treatment Part 2

SELECTION CRITERIA

Biological-treatment technologies vary greatly in their strengths and weaknesses.  The following are application criteria, which are normally relevant in evaluating various biological treatment options for the CPI:

Bioassay/toxicity control — The ability to control and minimize the impact of toxic constituents in wastewater on indicating organisms when the treated water is released

BOD removal efficiency — The ability to remove biodegradable, organic com pounds

COD removal efficiency — The ability to remove chemically oxidizable substances that may or may not be biodegradable

O&M costs — The cost to operate and maintain the treatment method

Sludge production — The amount of residual biological solids generated by the bio logical-treatment process

Sludge disposal costs — The cost to collect, dewater and dispose of residual sludge from the treatment method, either on-site or off-site

Performance in winter and summer — The degree in which high or low ambient temperatures will affect biological treatment

Performance on high- and low-temperature water — The degree in which high and low wastewater temperature will affect biological treatment

Operator attention — The relative amount of time required to operate the biological treatment system

Upset recovery — The amount of time it takes for a treatment method to recover from upset conditions.  Upset conditions are defined as abnormal variations in the flow or characteristics of the wastewater, which can detrimentally affect a biological treatment system

Expandability — The ease of expanding the treatment capacity to accommodate either an overall plant expansion or an increase in loading

Nitrification Efficiency — The relative ease of converting ammonia contained in wastewater to nitrates

VOC containment — The relative ease with which the biological treatment equipment can be enclosed to contain and collect VOC emissions

VOC stripping potential — The relative ease with which the biological-treatment system will strip volatile organic compounds from the wastewater

Ease of installation — The total amount of time and labor required to install the treatment method

Energy efficiency — The amount of energy used by a treatment method

Ease of secondary containment — The ability and ease with which the treatment system can be provided with secondary containment in case of overflow, spills or leaks

Space requirements — The area required by the treatment method

The use of microorganisms to remove contaminants from wastewater is effective and widespread. To choose the right system from the many options offered, understand the various techniques available and evaluate them based on your requirements.

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